What the main problem may be is that Namco isn't developing this game. People may figure out how to get into the Switch's files, as for Super Smash Switch, it'll probably be something along the lines of starting from scratch with research.

Some people have proven surprising knowledge of the Switch’s programming but there is NO WAY IN HELL we'll be at this level of modding on the newest gen system for a long time. That said... SMASH SWITCH HYPE!
Bananite

I'm more curious as to whether this will be Smash 5 or Smash 4 with extra DLC.I anticipate 5, but I hope its just a 4 re-release with bonus content + Wii U stuff so I don't have to buy a switch.
Antarctica

Smash 5 will probably be released at the end of the year,so maybe that's enough time for people to find a exploit. But even then it will take a few years before modding becomes as far as brawl and smash 4.

It took about two years for Brawl and SM4SH modding scene to start. Hope Lucas has custom moves this time around since they were previously unused data, and I was able to load it because of the Custom Move changer tutorial. I will finally continue modding since the Switch version has been announced.
I reach for the stars!